Given it is relatively shorter compared to the others does the early planing of the RS7 require a fair bit of pumping, and what sort of fin size compared to the others?

Cheers

No, I find the RS7 needs less pumping, it releases very quickly onto the fin after a couple of pumps. Fin size is the same as what I have used on the others, typical 57/58cm in 9.6 weather. Tail is wider than the Ultrasonic, narrower than the SLW and Falcon 152